1. Ensure About Phone> USB settings> set to Mass storage or Ask on connection however you must select Mass storage after the usb cable is connected.
2. Ensure Application > Development > USB debugging is unticked.
3. Goto Settings > SD card. you will see the Internal SD card Total space value.
4. Connect the usb data cable.
5. Goto notification, select Turn on USB storage. Select mount.
6. You will notice the Internal SD card Total space value become unavailable.
